Fluid speed-regulator for elevators



W. E. NICK ERSON. FLUID SPEED REGULATOR FOE ELEVATORS.-

(No Model.)

No. 396,949. Patented Jan. 29-, 1889,

N PEYERS. PhoIo-mmnplver, Waahingwl. ac;

UNITED STATES PATENT ()EEICE.

WILLIAIII I 1. NICKERSON, OF CAMBRIDGE, MASSACIIUSE'FPS.

FLUID SPEED REGULATOR FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 396,949, dated January 29, 1889.

Application filed September 21, 1888. Serial No, 285,995. (No model.)

To (ZZZ whom it nuty concern.-

Ile it known that I, \YILLIAM E. NIGKER- SON, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented a certain new and usefulImprovement in Fluid Spcod-Regulators for Elevators, &c., of which the following, taken in connection with the accompanyingdrawings, is a specification.

The object of my invention is to so improve that class of speedregulators in which fluid is used in cylinders that there will be a perfect automatic change of place of the fluid without loss or want of compensation, and also to an range a novel system of passages in the piston, by which the flow of the fluid in passing through the moving piston from one side to the other is self-regnlatin in adapting itself to the varying rapidity of motion of the piston, and through it the speed of the machine. These obj eots I attain by the mechanism shown in the accompanying drawings, in which Figure l. is a view partly in elevation and partly in vertical section, and intended to illustrate in a general way the application of my invention to regulating the speed. of an elevator. Fi 2 is an enlarged vertical section through the piston, taken on line X X of Fig. 3, a part of the cap-piece being represented as removed. Fig. 3 is a plan of the piston, a part of the cap-piece being represented as removed to show the position of the passages in the interior of the piston; and Fig. 4: is a vertical section of the piston, taken on line y 1 of Fig.

In the drawings, Fig. I, A represents a frame-work, to which the shalftli is connected. Upon one end of the shaft I3, I have a gearwheel, D which is driven by a worm, 1-3 in the usual manner. Upon the shaft I3 mounted a drum, II, which operates thehoisting-rope 1-3.

C, Fig. 1, is a crank-disk attached to the end of the shaft i. This crank-disk C has upon it a crank-pin, (l,which gives motion, through the pitman C cross-head P and pistonrod P P, to the piston P in the cylinder D.

D, Fig. 1, is a frame for supporting the ways IV \V, upon. which the cross-head P slides.

At the upper end of the cylinderD,I have a small reservoir, P", which serves to take up any oil that may leak through the box P, or that may have become an excess through leakage of the box P in the auxiliary chamber D or from the loss of ;fluid-=space caused by the advance of the piston-ro .l P into the chamber I)". This excess is conveyed from the chamber D to the reservoir P by the pipe .11.

E, Fig. l, is a vent-hole made in the top of the reservoir 1".

I will now describe the construction and arrz'mgement of the piston I shown in Figs. 2, 3, and -:t.

P represents the body of the piston, and has on each side circular grooves T T Figs. 2 and 3, the grooves T T on one side of the body P being connected to the corresponding grooves on the other side by holes T" T, which extend through the 1' iston-bodyP. The caps I P that are fastened to the piston-body P, are provided with openings T T, which connect with the circular grooves T T made in the body P. The openings T T in the caps P P are not opposite the holes T T made in the body P, so that the fluid in passing from one side of the piston to the other cannot pass straight through, but must form currents that turn a right angle twice in the passage, and also intermingle with each other,

and thus greatly lessen the velocity of :flowing. The proportional lessening of velocity due to angular turns and intermingling of currents increases rapidly with the increase of velocity of current, so while slowlyqnoving currents are not much affected. by abrupt turnsor by the intermingling, rapidlyanoving ones are much affected.

It thought desirable, the pipe II may discharge the surplus from the auxiliary chamber D into an independent reservoir instead of into the reservoir 1", the object of the receiving-reservoir being to hold the surplus from the auxiliary chamber D and to return it through the pipe II during the upward stroke of the piston P.

I claim" I. In a fluid speed-regulator, the combination of the cylinder D, the piston-rod P P and the piston P, having openings whereby the fiuid may pass from one side to the other, In testimony whereof Ihave signed my name with the auxiliary chambers D and P and resto this specification, in the presence of two subervoir-pipe H, substantially as described, and scribing Witnesses, on this 19th day of Sepfor the purpose set forth. teinber, A. D. 1888. 5 2. In a fluid speed-reguiator, the combination of the cap P, having openings T T, with \VILLIAM E. NICKERSON. the body P of the piston, having grooves T I T and intermediate openings/1 1, substan- I Vitnesses:

tially as described, and for the purpose set FRANK G. PARKER, 10 forth. 1 WILLIAM EDSON. 

